Definition of hallmark noun from the Oxford Advanced American Dictionary

     

    hallmark

     noun
    noun
    NAmE//ˈhɔlmɑrk//
     
     
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  1. 1a feature or quality that is typical of someone or something Police said the explosion bore all the hallmarks of a terrorist attack.
  2. 2a mark put on gold, silver, and platinum objects that shows the quality of the metal and gives information about when and where the object was made
See the Oxford Advanced Learner's Dictionary entry: hallmark